Man, I wish mine was as accessible as yours appears to be! I used this same screw in this same location, but on my 2017, I have MUCH less "access" to get the nut on the screw.

So I had to simultaneously: 1) hold the valve in just the right open position so I could turn the screw 2) hold the nut in the perfect orientation with some needle nose pliers 3) turn the screw until it caught the nut.

Man, I wish mine was as accessible as yours appears to be! I used this same screw in this same location, but on my 2017, I have MUCH less "access" to get the nut on the screw.

So I had to simultaneously: 1) hold the valve in just the right open position so I could turn the screw 2) hold the nut in the perfect orientation with some needle nose pliers 3) turn the screw until it caught the nut.

So what you are saying is you got it done, just needed three hands to do it.

I did the exact same thing with mine after seeing your post. I have zero drone, and I do notice a louder tone at a cold start. Other than that, I haven't noticed too much difference. I think it's time to remove the flapper and muffler and have a pipe added...

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For those that welded/clamped open the flapper or cut it out completely, did you notice a performance difference or a stumble in the engine and exhaust when starting it up or revving it a little at idle?

I have a 6.2L with a supercharger and tied mine open for a few days. The performance (mainly throttle response) took a hit and there was a stumble while giving it a slight rev at idle. Maybe a back-pressure issue...?

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I have a 6.2L with a supercharger and tied mine open for a few days. The performance (mainly throttle response) took a hit and there was a stumble while giving it a slight rev at idle. Maybe a back-pressure issue...?

You have a 6.2 with a supercharger? In a truck? That must be fun!! I want one!!

You have a 6.2 with a supercharger? In a truck? That must be fun!! I want one!!

Yep, very, VERY fun. I'm still trying to figure out if tying the flapper open robs you of some low end torque though. Or maybe I'm having a problem because the truck has a supercharger with a Magnuson tune so any little change that produces a small of amount of negative effect is amplified and felt more than it would have been in a stock truck.

For those that welded/clamped open the flapper or cut it out completely, did you notice a performance difference or a stumble in the engine and exhaust when starting it up or revving it a little at idle?

I have a 6.2L with a supercharger and tied mine open for a few days. The performance (mainly throttle response) took a hit and there was a stumble while giving it a slight rev at idle. Maybe a back-pressure issue...?

Mine runs no differently w/ the flapper bolted open. Only difference I've noticed is a little bit louder at startup when I auto-start it in the barn, and a SLIGHT helicopter sound under light acceleration in V4 mode.